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a high-end graphing calculator from Texas Instruments capable of 3D graphing, computing definite and indefinite integrals and derivates among with numerous useful features.
a: did you get that second problem from last night's homework?
b: yea, of course.
a: how? we didn't learn how to integrate logarithmic functions yet!
b: we didn't but my ti89 did!
a: you bastard!
by alperthereal February 10, 2004
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Oct 29 Word of the Day
When you meet with someone without anyone knowing except you and the person.
by Timbs March 08, 2017
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a secret organization only known by those who have a calculator of the same name. While other math students fumble with equations, the TI-89er relaxes as s/he's just used the solve() function. And as all the other dumbasses observe, s/he simple responds "TI-89," and other students will simply cower and look elsewhere.
Oh, the TI-89's? Well, if I told you I'd have to kill you.
by Orion January 15, 2004
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Graphing calculator that has the meaning of life. Not only does it do math for you, but it also does your laundry!
The AP board is examining your test, and sees that you miraculously have the answer in one step. The justification is "Ti-89".....automatic 5!
by la Morsa December 11, 2003
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1. A far superior model to its counterpart, the ti-83. Can graph 3D functions, differentiate and integrate and calculate Taylor series. The symbol of a true math or science geek.

2. The main reason I'm passing college math.
1. I really need to get a ti-89. This crap is too hard.

2. I LOVE MY TI-89!!!
by BKred January 18, 2004
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Definition: the Texas Instruments 89. Known by every student in American high schools as an Original Game Boy, that also can graph differential equations and keep useful notes for tests.
Alternate Definition: a Dell
"Dude I just got the best game for my TI-89, f-ing Track and Field 1998!"
"Oh man you're so lucky, I still have only an 83, but I got Pimp Quest, mother f-er."
by řikupich November 28, 2004
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The Holy Grail of Calculators. This baby can do everything from calculate how much you need to tip your lovely waitress to graph a complicated integral that even your Calculus teacher will be amazed by. O and don't worry it can do much, much more. Too much, that a normal human could never actually figure out all it's features in an entire lifetime. It is the Ultimate / Only friend of an Engineering Major.
Kim : I looked up Calculator in the dictionary the other day, and it wasn't defined!

Tom: What do you mean?

Kim: All it said was: See Ti89.
by KBUR July 16, 2008
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